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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 LT |
17 | */ |
18 | #ifndef __XFS_ALLOC_H__ | |
19 | #define __XFS_ALLOC_H__ | |
20 | ||
21 | struct xfs_buf; | |
22 | struct xfs_mount; | |
23 | struct xfs_perag; | |
24 | struct xfs_trans; | |
25 | ||
26 | /* | |
27 | * Freespace allocation types. Argument to xfs_alloc_[v]extent. | |
28 | */ | |
29 | typedef enum xfs_alloctype | |
30 | { | |
31 | XFS_ALLOCTYPE_ANY_AG, /* allocate anywhere, use rotor */ | |
32 | XFS_ALLOCTYPE_FIRST_AG, /* ... start at ag 0 */ | |
33 | XFS_ALLOCTYPE_START_AG, /* anywhere, start in this a.g. */ | |
34 | XFS_ALLOCTYPE_THIS_AG, /* anywhere in this a.g. */ | |
35 | XFS_ALLOCTYPE_START_BNO, /* near this block else anywhere */ | |
36 | XFS_ALLOCTYPE_NEAR_BNO, /* in this a.g. and near this block */ | |
37 | XFS_ALLOCTYPE_THIS_BNO /* at exactly this block */ | |
38 | } xfs_alloctype_t; | |
39 | ||
40 | /* | |
41 | * Flags for xfs_alloc_fix_freelist. | |
42 | */ | |
43 | #define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */ | |
d210a28c | 44 | #define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/ |
1da177e4 LT |
45 | |
46 | /* | |
47 | * Argument structure for xfs_alloc routines. | |
48 | * This is turned into a structure to avoid having 20 arguments passed | |
49 | * down several levels of the stack. | |
50 | */ | |
51 | typedef struct xfs_alloc_arg { | |
52 | struct xfs_trans *tp; /* transaction pointer */ | |
53 | struct xfs_mount *mp; /* file system mount point */ | |
54 | struct xfs_buf *agbp; /* buffer for a.g. freelist header */ | |
55 | struct xfs_perag *pag; /* per-ag struct for this agno */ | |
56 | xfs_fsblock_t fsbno; /* file system block number */ | |
57 | xfs_agnumber_t agno; /* allocation group number */ | |
58 | xfs_agblock_t agbno; /* allocation group-relative block # */ | |
59 | xfs_extlen_t minlen; /* minimum size of extent */ | |
60 | xfs_extlen_t maxlen; /* maximum size of extent */ | |
61 | xfs_extlen_t mod; /* mod value for extent size */ | |
62 | xfs_extlen_t prod; /* prod value for extent size */ | |
63 | xfs_extlen_t minleft; /* min blocks must be left after us */ | |
64 | xfs_extlen_t total; /* total blocks needed in xaction */ | |
65 | xfs_extlen_t alignment; /* align answer to multiple of this */ | |
66 | xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */ | |
67 | xfs_extlen_t len; /* output: actual size of extent */ | |
68 | xfs_alloctype_t type; /* allocation type XFS_ALLOCTYPE_... */ | |
69 | xfs_alloctype_t otype; /* original allocation type */ | |
70 | char wasdel; /* set if allocation was prev delayed */ | |
71 | char wasfromfl; /* set if allocation is from freelist */ | |
c41564b5 | 72 | char isfl; /* set if is freelist blocks - !acctg */ |
1da177e4 | 73 | char userdata; /* set if this is user data */ |
d210a28c | 74 | xfs_fsblock_t firstblock; /* io first block allocated */ |
1da177e4 LT |
75 | } xfs_alloc_arg_t; |
76 | ||
77 | /* | |
78 | * Defines for userdata | |
79 | */ | |
80 | #define XFS_ALLOC_USERDATA 1 /* allocation is for user data*/ | |
81 | #define XFS_ALLOC_INITIAL_USER_DATA 2 /* special case start of file */ | |
82 | ||
83 | ||
84 | #ifdef __KERNEL__ | |
85 | ||
86 | #if defined(XFS_ALLOC_TRACE) | |
87 | /* | |
88 | * Allocation tracing buffer size. | |
89 | */ | |
90 | #define XFS_ALLOC_TRACE_SIZE 4096 | |
91 | extern ktrace_t *xfs_alloc_trace_buf; | |
92 | ||
93 | /* | |
94 | * Types for alloc tracing. | |
95 | */ | |
96 | #define XFS_ALLOC_KTRACE_ALLOC 1 | |
97 | #define XFS_ALLOC_KTRACE_FREE 2 | |
98 | #define XFS_ALLOC_KTRACE_MODAGF 3 | |
99 | #define XFS_ALLOC_KTRACE_BUSY 4 | |
100 | #define XFS_ALLOC_KTRACE_UNBUSY 5 | |
101 | #define XFS_ALLOC_KTRACE_BUSYSEARCH 6 | |
102 | #endif | |
103 | ||
104 | /* | |
105 | * Compute and fill in value of m_ag_maxlevels. | |
106 | */ | |
107 | void | |
108 | xfs_alloc_compute_maxlevels( | |
109 | struct xfs_mount *mp); /* file system mount structure */ | |
110 | ||
111 | /* | |
112 | * Get a block from the freelist. | |
113 | * Returns with the buffer for the block gotten. | |
114 | */ | |
115 | int /* error */ | |
116 | xfs_alloc_get_freelist( | |
117 | struct xfs_trans *tp, /* transaction pointer */ | |
118 | struct xfs_buf *agbp, /* buffer containing the agf structure */ | |
119 | xfs_agblock_t *bnop); /* block address retrieved from freelist */ | |
120 | ||
121 | /* | |
122 | * Log the given fields from the agf structure. | |
123 | */ | |
124 | void | |
125 | xfs_alloc_log_agf( | |
126 | struct xfs_trans *tp, /* transaction pointer */ | |
127 | struct xfs_buf *bp, /* buffer for a.g. freelist header */ | |
128 | int fields);/* mask of fields to be logged (XFS_AGF_...) */ | |
129 | ||
130 | /* | |
131 | * Interface for inode allocation to force the pag data to be initialized. | |
132 | */ | |
133 | int /* error */ | |
134 | xfs_alloc_pagf_init( | |
135 | struct xfs_mount *mp, /* file system mount structure */ | |
136 | struct xfs_trans *tp, /* transaction pointer */ | |
137 | xfs_agnumber_t agno, /* allocation group number */ | |
138 | int flags); /* XFS_ALLOC_FLAGS_... */ | |
139 | ||
140 | /* | |
141 | * Put the block on the freelist for the allocation group. | |
142 | */ | |
143 | int /* error */ | |
144 | xfs_alloc_put_freelist( | |
145 | struct xfs_trans *tp, /* transaction pointer */ | |
146 | struct xfs_buf *agbp, /* buffer for a.g. freelist header */ | |
147 | struct xfs_buf *agflbp,/* buffer for a.g. free block array */ | |
148 | xfs_agblock_t bno); /* block being freed */ | |
149 | ||
150 | /* | |
151 | * Read in the allocation group header (free/alloc section). | |
152 | */ | |
153 | int /* error */ | |
154 | xfs_alloc_read_agf( | |
155 | struct xfs_mount *mp, /* mount point structure */ | |
156 | struct xfs_trans *tp, /* transaction pointer */ | |
157 | xfs_agnumber_t agno, /* allocation group number */ | |
158 | int flags, /* XFS_ALLOC_FLAG_... */ | |
159 | struct xfs_buf **bpp); /* buffer for the ag freelist header */ | |
160 | ||
161 | /* | |
162 | * Allocate an extent (variable-size). | |
163 | */ | |
164 | int /* error */ | |
165 | xfs_alloc_vextent( | |
166 | xfs_alloc_arg_t *args); /* allocation argument structure */ | |
167 | ||
168 | /* | |
169 | * Free an extent. | |
170 | */ | |
171 | int /* error */ | |
172 | xfs_free_extent( | |
173 | struct xfs_trans *tp, /* transaction pointer */ | |
174 | xfs_fsblock_t bno, /* starting block number of extent */ | |
175 | xfs_extlen_t len); /* length of extent */ | |
176 | ||
177 | void | |
178 | xfs_alloc_mark_busy(xfs_trans_t *tp, | |
179 | xfs_agnumber_t agno, | |
180 | xfs_agblock_t bno, | |
181 | xfs_extlen_t len); | |
182 | ||
183 | void | |
184 | xfs_alloc_clear_busy(xfs_trans_t *tp, | |
185 | xfs_agnumber_t ag, | |
186 | int idx); | |
187 | ||
188 | ||
189 | #endif /* __KERNEL__ */ | |
190 | ||
191 | #endif /* __XFS_ALLOC_H__ */ |